Dentist&#39;s flask.



' PATENTED MAR. 17, 1903.

A. S. STEIGERWALD.

DENTISTS PLASK.

APPLIOATIOH FILED APR. 11, 1902.

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WITNESSES:

,4 TTOHNEY.

UNITED STATES PATENT OFFICE.

ANDRElV S. STEIGERWA'LD, OF PHILADELPHIA, PENNSYLVANIA.

DENTISTS FLASK.

SPECIFICATION forming part of Letters Patent No. 722,765, dated March17, 1903.

Application filed April 11, 1902. Serial No. 102.359. (N0 model.)

To ctZZ whom, it may concern:

Be it known that I, ANDREW S. STEIGER- WALD, a citizen of the UnitedStates, residing in the city and county of Philadelphia, State ofPennsylvania, have invented certain new and useful Improvements inDentists Flasks, of which the following is a full, clear, and exactdescription, reference being had to the accompanying drawings, of whichFigure 1 is a plan view; Fig. 2, a section on line a: :0, Fig. 1; Fig.3, a side elevation of the flask detached from the holding-base, thecover being detached; Fig. 4, a side elevation of the drag and copedetached; Fig. 5, a plan view of the holding-base detached; Fig. 6, aplan view of the annulus provided with the internal flange.

The object of this invention is to provide a dentists flask of simpleand convenient construction.

The precise nature of the invention will appear from the followingspecification, reference being had to the accompanying drawings, inwhich 1 denotes the pan-shaped bottom portion of the flask, hereinaftertermed the drag, which has at its top an external peripheral flange 2,that is provided with slots 3.

4 is the upper portion of the flask, hereinafter termed the cope, whichis in the form of a frustum of a hollow cone that is open at the topand'bottom. The internal diameter of the lower or wider end of this copeis substantially equal to that of the upper end of the drag, as seen inFig. 2. Said cope is provided with vertically-depending lugs 5, thatcorrespond with and are adapted to register with and be entered,respectively, into the aforesaid slots 3 of the drag when the cope issuitably placed upon the drag, as shown.

6 is an annulus that is provided with an internal flange 7 at its lowerend and with internal screw-threads 8 at and adjacent to its upper end.

9 is a top or cover whose periphery is provided with screw-threadscorresponding with and adapted to engage the threads of the annulus 6.

In the present instance part of the upper side of said cover isdepressed, but with a central rectangular part or lug 10 for theconvenient turning of the cover by means of a wrench applied to the lug.

In using the flask the drag 1 is filled with plaster-of-paris, and thewax pattern of the denture is then embedded'therein. The cope is thenplaced upon the drag, the lugs of the former being entered into theslots 3 of the latter, (thus insuring the apposition of the cope anddrag,) and it (the cope 4) is filled with plaster-of-paris and leveledoiI" flush with the top. The cope is now separated from the drag and thepattern removed, and the mold in the drag is then filled with stripsofindiarubber, all in the usual way. The cope is now placed over thedrag as before, the lugs 5 being entered in the slots 3, as in Fig. 4.These parts are then inserted within the annulus 6, the flange of thedrag resting upon the flange 7 of the annulus. The cover 9 is finallyentered into the latter and screwed down upon the top of the cope, thusforcing the latter against or adjacent to the drag, at the same timecompressing the rubber in the mold of the latter. The flask is now readyto go into the muffle.

For convenience in manipulating the parts and screwing down the cover, Iprovide an annular base 11, Figs. 1 and 2, adapted to receive the lowerportion of the drag and having lugs 12, with holes 13 for screws orbolts for fastening the base to a table or bench, and in order toprevent the drag from turning I provide it with opposite lugs 14:, thatare adapted to engage corresponding vertical slots 15 (indicated in Fig.2) on the inner side of said base. I

As a convenient means for preventing the rotation of the annulus 8 whenthe cover is being screwed therein I provide slots in the flange 7 ofthe annulus corresponding with the slots 3 in the flange of the drag,and I also make the lugs 5 of the cope of sufficient length to projectinto the said slots, respectively, of the annulus. One of the latterslots is indicated at 16 in Fig. 2, in which on that side one of thelugs 5 is shown entered into one of said slots, as well as a slot 3 inthe flange of the drag.

When the flask is ready to be placed in the muffle, it is lifted out ofthe base.

As the flasks may be piled one on the other in the muifle, I prefer tohave the top of the lug of the cover flush with or slightly below theplane of the annulus, as seen in Fig. 2.

It will be obvious that the several parts of my improved flask may bereadily cast in metal and may be conveniently put together and separatedand that the screw-cover gives an even and gradual pressure upon thecope, and thus a like compression of the rubber between it and the drag.

Having thus described my invention, 1 claim as new and desire to secureby Letters Patent- 1. In a dentists flask the combination of the draghaving the peripheral flange, the

. cope open at the top, the annulus having the flange adapted to engagesaid flange of the drag, and the cover adapted to screw into saidannulus and bear upon and close the top of said cope, substantially asand for the purpose set forth.

2. In a dentists flask, the combination of the drag having theperipheral flange, the cope open at the top, the annulus having theinternal screw-threads and the flange adapted to engage said flange ofthe drag, the cover having the peripheral screw-threads correspondingwith and adapted to engage the screw-threads of the annulus, togetherwith means for maintaining the drag and cope in apposition,substantially as and for the purpose set forth.

3. In a dentists flask, the combination of the drag, having theperipheral flange and the slots therein, the cope open at the top andhaving the peripheral dependinglugs adapted to register with and entersaid slots, the annulus having the flange adapted to engage said flangeof the drag, and the cover adapted to screw into said annulus and tobear upon and close the top of said cope, substantially as and for thepurpose set forth.

4:. In a dentists flask, the combination of the drag having theperipheral flange, the cope open at the top, the annulus having theflange adapted to engage said flange of the drag, the cover adapted toscrew into said annulus and to bear upon and close the top of said cope,and means for preventing the rotation of the annulus and drag withrelation to each other, substantially as and for the purpose set forth.

5. In a dentists flask, the combination of the drag having theperipheral flange and the slots in the latter, the cope open at the top,the annulus provided with the flange adapted to engage said flange ofthe drag, and having also the slots adapted to register with said slotsof the flange of the drag, the peripheral depending lugs of said copeadapted to register with and to be entered respectively into the saidslots of the drag and also those of the annulus, and the cover adaptedto screw into said annulus and to bear upon and close the top of saidcope, substantially as and for the purpose set forth.

6. In a dentists flask, the combination of the drag having theperipheral flange, the cope open at the top, the annulus having theflange adapted to engage said flange of the drag, the cover adapted toscrew into said annulus and to bear upon and close the top of said cope,means for preventing the rotation of the drag and annulus with relationto each other, the annular base adapted to reoeive said drag, and meansfor preventing the rotation of the latter with relation to said base,substantially as and for the purpose set forth.

7. In a dentists flask, the combination of the drag having theperipheral flange, and the lugs, 14, the cope open at the top, theannulus having the flange adapted to engage said flange of the drag, thecover adapted to screw into said annulus and bear upon and close the topof said cope, the base adapted to receive said drag, and having theslots into which the said lugs of the drag are adapted to be entered,substantially as and for the purpose set forth. I

8. In a dentists flask, the combination of the drag having theperipheral flange, the cope open at the top, the annulus having theflange adapted to engage said flange of the drag, and the cover adaptedto screw into said annulus and to bear upon and close the top of saidcope, and having the lug, 10, or the like for turning it, the saidannulus, substantially as and for the purpose set forth.

In testimony whereof I have hereunto affixed my signature this 17th dayof March, A. D.'1902.

ANDREW S. STEIGERWALD.

Witnesses:

ANDREW V. GRoUPE, WALTER G. PUSEY.

